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| I used this method on a gas engine....Soak a while with deep creep or something like that, If the valves aren't stuck, release the spring pressure on them so they are both closed....take out the injector or sparkplug, I broke a sparkplug and welded a grease fitting on it, and re-inserted it in the cylinder head....pumped full of grease till the piston broke loose...works on the principle of a hydraulic jack.
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